Price-Lock Windows for Crypto Checkout Quotes: How Developers Should Handle Expiry

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Crypto payment gateways typically honour a quoted amount for a fixed window because cryptocurrency prices fluctuate. Developers integrating a gateway should store the expiry time provided by the gateway rather than computing it locally, and model order states such as awaiting payment, expired, detected, and underpaid or overpaid. State changes should be driven only by gateway webhooks or a scheduled expiry job, with guards that prevent overwriting newer states. The article also recommends a predefined policy for late payments, a server-based countdown, a clear network display, and thorough sandbox testing of edge cases like partial payments and duplicate webhooks.

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